Creation of a Mini Python Application with PyQt5 and Qt Designer

We will see in this practical tutorial, how to create a mini PyQt5 application With Qt Designer which asks the user to enter an integer N and return its double 2 * N by clicking on the Validate button:

 

from PyQt5 import QtCore, QtGui, QtWidgets

class Ui_Form(object):
    
    def action(self):
        N = int(self.lineEdit.text())
        N2 = 2*N
        self.lineEdit_2.setText(str(N2))
    
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(400, 300)
        self.label = QtWidgets.QLabel(Form)
        self.label.setGeometry(QtCore.QRect(20, 30, 151, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.label.setFont(font)
        self.label.setStyleSheet("color: rgb(0, 0, 255);")
        self.label.setObjectName("label")
        self.label_2 = QtWidgets.QLabel(Form)
        self.label_2.setGeometry(QtCore.QRect(20, 80, 151, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.label_2.setFont(font)
        self.label_2.setStyleSheet("color: rgb(0, 0, 255);")
        self.label_2.setObjectName("label_2")
        self.lineEdit = QtWidgets.QLineEdit(Form)
        self.lineEdit.setGeometry(QtCore.QRect(170, 29, 191, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.lineEdit.setFont(font)
        self.lineEdit.setStyleSheet("color: rgb(255, 0, 0);")
        self.lineEdit.setObjectName("lineEdit")
        self.lineEdit_2 = QtWidgets.QLineEdit(Form)
        self.lineEdit_2.setGeometry(QtCore.QRect(170, 80, 191, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.lineEdit_2.setFont(font)
        self.lineEdit_2.setStyleSheet("color: rgb(255, 0, 0);")
        self.lineEdit_2.setObjectName("lineEdit_2")
        self.pushButton = QtWidgets.QPushButton(Form)
        self.pushButton.clicked.connect(self.action)
        self.pushButton.setGeometry(QtCore.QRect(170, 132, 181, 31))
        font = QtGui.QFont()
        font.setPointSize(16)
        font.setBold(True)
        font.setWeight(75)
        self.pushButton.setFont(font)
        self.pushButton.setStyleSheet("background-color: rgb(255, 255, 0);")
        self.pushButton.setObjectName("pushButton")

        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "Form"))
        self.label.setText(_translate("Form", "Value Of N :"))
        self.label_2.setText(_translate("Form", "Double 2*N :"))
        self.pushButton.setText(_translate("Form", "Validate"))


if __name__ == "__main__":
    import sys
    app = QtWidgets.QApplication(sys.argv)
    Form = QtWidgets.QWidget()
    ui = Ui_Form()
    ui.setupUi(Form)
    Form.show()
    sys.exit(app.exec_())

Younes Derfoufi
my-courses.net